Blood tests. If your child's white blood cell count is abnormal, a Mayo Clinic pediatric hematologist will work closely with lab specialists and others to determine the type of white blood cell disorder and the cause.

Bone marrow biopsy. Doctors insert a thin needle into the bone to collect a tissue sample and then examine the cells under a microscope.

Additional tests. More tests, such as imaging tests, may be needed for proper diagnosis. In tests that involve radiation, specialists carefully monitor doses to avoid the risk of radiation overexposure.

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